Guided Evolution of Bulk Metallic Glass Nanostructures: A Platform for Designing 3D Electrocatalytic Surfaces

Gustavo Doubek, Ryan C. Sekol, Jinyang Li, Won Hee Ryu, Forrest S. Gittleson, Siamak Nejati, Eric Moy, Candy Reid, Marcelo Carmo, Marcelo Linardi, Punnathat Bordeenithikasem, Emily Kinser, Yanhui Liu, Xiao Tong, Chinedum O. Osuji, Jan Schroers, Sundeep Mukherjee, André D. Taylor

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Several strategies of subtractive and additive surface modification on bulk metallic glasses (BMG) surfaces were demonstrated to form unique morphologies and compositions by post-processing. BMG nanorod arrays of Pt-BMG(57) and Pt-BMG(42) were formed with a top-down thermoplastic molding procedure and detached from disks by sonication. BMG nanorods were then dealloyed to show the evolution of their electrochemical surface area (ECSA). Voltammetric profiles were recorded every 100 cycles and the ECSA was calculated from the hydrogen desorption peaks located between 0.2 and 0.1 V versus Ag/AgCl. After only 200 cycles the ECSA of the Pt-BMG(57) stabilizes and the dealloying rate drops to nearly zero, corresponding to a passivation of the surface. In contrast, the ECSA of Pt-BMG(42) continuously increases over 2000 cycles. Cyclic voltammograms of the MnOx-Pt-BMG(57) nanorod array exhibit a rectangular charge/discharge profile, suggesting good charge storage capability. Due to the use of a high surface area BMG nanorod scaffold, the coated array exhibits a specifi c capacitance 2.1 times higher than that of a MnOx-Pt-BMG(57) flat disk.

Original languageEnglish (US)
Pages (from-to)1940-1949
Number of pages10
JournalAdvanced Materials
Volume28
Issue number10
DOIs
StatePublished - 2016

Keywords

  • bulk metallic glass
  • electrocatalysts
  • nanomaterials
  • pesudocapacitors
  • surface modification

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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